ams AG - global leader in the design and manufacture of high performance analog ICs (integrated circuits)

AS3643 LED-flash Driver

1.3A single LED-flash driver

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The AS3643 is an inductive high efficient DCDC step up converter with two current sinks. The DCDC step up converter operates at a fixed frequency of 4MHz and includes soft startup to allow easy integration into noise sensitive RF systems. The two current sinks can operate in flash / torch / assist (=video) light modes. The AS3643 includes flash timeout, overvoltage, overtemperature, undervoltage and LED short circuit protection functions.


Key Features

  • 4MHz fixed frequency DCDC
  • Small chip-scale package
  • Overvoltage, overtemperature, undervoltage, flash timeout and LED short circuit protection functions.

Key Benefits

  • Tiny external coils
  • Small system size
  • High system safety

Product Facts

Topology Inductive
DC-DC frequ. [MHz] 4
Performance [ILed max] 1300mA
- [Vout max] 5.5
LED channels [Curr. sinks] 2
- [Curr. source] low side
- [Flash LEDs] 1
- [Indicator LED] Flash LED
Interfaces [I²C]
- [Enable]
Safety features [TimeOut]
- [TXMask]
Package WL-CSP-13 (2.25x1.5)-0.5p

Additional Information


Small size single LED flash solution for mobile phones